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CO_E_INIT_UNACCEPTED_USER_ALLOCATOR
COM rejected the caller-supplied allocator
CO_E_INIT_UNACCEPTED_USER_ALLOCATOR is HRESULT 2147500045 (0x8000400D) from winerror.h. The documented description is “The user supplied memory allocator is unacceptable.” The value must be interpreted at legacy COM initialization that permits or discovers an application-provided allocator.
The allocator supplied by the caller does not satisfy COM allocation, reallocation, freeing, or ownership requirements. For reliable triage of this result, store the native HRESULT and symbolic identity before generic error handling rewrites either one.
Where the result appears
- This result may surface in legacy COM initialization that permits or discovers an application-provided allocator.
Typical causes and interpretation
Common cause categories are: the allocator is incomplete; returned memory is misaligned; free and realloc semantics differ; the object lifetime ends before COM shutdown. Investigate this result through falsifiable cause hypotheses and keep the first lower-level failure that explains the observed HRESULT.
Key distinction: the allocator supplied by the caller does not satisfy COM allocation, reallocation, freeing, or ownership requirements.
Correct handling and recovery
The appropriate recovery is to use the system COM allocator unless the API explicitly requires a custom allocator, and validate the full IMalloc contract with allocation/free pairs. Do not loop on it; retry only under a documented transient condition with bounded delay and post-operation reconciliation.
After observing it, separate local resource cleanup from server-side reconciliation and perform each only for the failing activity ID.
Practical scenario
A custom allocator returns aligned blocks but frees them through a different heap, so COM rejects it before activation begins.
Difference from related HRESULTs
CO_E_INIT_MEMORY_ALLOCATOR is failure to initialize an accepted allocator; this code means the proposed user allocator itself is unacceptable.
Preserve the neighboring-result distinction in metrics and incident reports to avoid applying the wrong remediation.
References
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